The first problem is speed. Everything you do on the Surface takes
more time than you expect. When you load an app, switch between
apps, launch a Web page, go back to a previous Web page, check
your email, and do pretty much anything else, you’ll find yourself
waiting a half-second too long. This sounds like nothing, but when
you compound that time time across every action on the Surface,
the wasted half-seconds add up to an annoying trudge.

Funny how the tables turn. A decade ago, Windows XP was snappy and Mac OS X was the one where things like resizing windows or even pulling down menus felt slow. I think this is a major problem for Microsoft, though, because responsiveness is more important on touchscreen UIs than desktop UIs.